<s>
The	O
skin	B-Algorithm
temperature	I-Algorithm
of	O
an	O
atmosphere	O
is	O
the	O
temperature	O
of	O
a	O
hypothetical	O
thin	O
layer	O
high	O
in	O
the	O
atmosphere	O
that	O
is	O
transparent	O
to	O
incident	O
solar	O
radiation	O
and	O
partially	O
absorbing	O
of	O
infrared	O
radiation	O
from	O
the	O
planet	O
.	O
</s>
<s>
The	O
skin	B-Algorithm
temperature	I-Algorithm
of	O
an	O
atmosphere	O
should	O
not	O
be	O
confused	O
with	O
the	O
surface	O
skin	B-Algorithm
temperature	I-Algorithm
,	O
which	O
is	O
more	O
readily	O
measured	O
by	O
satellites	O
,	O
and	O
depends	O
on	O
the	O
thermal	O
emission	O
at	O
the	O
surface	O
of	O
a	O
planet	O
.	O
</s>
<s>
The	O
concept	O
of	O
a	O
skin	B-Algorithm
temperature	I-Algorithm
builds	O
on	O
a	O
radiative-transfer	O
model	O
of	O
an	O
atmosphere	O
,	O
in	O
which	O
the	O
atmosphere	O
of	O
a	O
planet	O
is	O
divided	O
into	O
an	O
arbitrary	O
number	O
of	O
layers	O
.	O
</s>
<s>
Therefore	O
,	O
by	O
rearranging	O
the	O
above	O
equation	O
,	O
the	O
skin	B-Algorithm
temperature	I-Algorithm
can	O
be	O
related	O
to	O
the	O
equilibrium	O
temperature	O
of	O
an	O
atmosphere	O
by	O
:	O
</s>
<s>
The	O
skin	B-Algorithm
temperature	I-Algorithm
is	O
thus	O
independent	O
of	O
the	O
absorptivity/emissivity	O
of	O
the	O
skin	O
layer	O
.	O
</s>
<s>
A	O
multi-layered	O
model	O
of	O
a	O
greenhouse	O
atmosphere	O
will	O
produce	O
predicted	O
temperatures	O
for	O
the	O
atmosphere	O
that	O
decrease	O
with	O
height	O
,	O
asymptotically	O
approaching	O
the	O
skin	B-Algorithm
temperature	I-Algorithm
at	O
high	O
altitudes	O
.	O
</s>
<s>
These	O
inversions	O
take	O
place	O
in	O
the	O
stratosphere	O
and	O
the	O
thermosphere	O
,	O
due	O
to	O
absorption	O
of	O
solar	O
ultraviolet	B-Application
(	O
UV	O
)	O
radiation	O
by	O
ozone	O
and	O
absorption	O
of	O
solar	O
extreme	O
ultraviolet	B-Application
(	O
XUV	O
)	O
radiation	O
respectively	O
.	O
</s>
<s>
The	O
skin	B-Algorithm
temperature	I-Algorithm
is	O
a	O
close	O
approximation	O
for	O
the	O
temperature	O
of	O
the	O
tropopause	O
on	O
Earth	O
.	O
</s>
<s>
An	O
equilibrium	O
temperature	O
of	O
255	O
K	O
on	O
Earth	O
yields	O
a	O
skin	B-Algorithm
temperature	I-Algorithm
of	O
214	O
K	O
,	O
which	O
compares	O
with	O
a	O
tropopause	O
temperature	O
of	O
209	O
K	O
.	O
</s>
